Improvement in valve-gears of pumping-engines



UNrTED STATES PATENT OFFICE.

IMPROVEMENT IN VALVE-GEARS OF PUMPlNG-ENGINES.

Specification forming part of Letters Patent No. 117,570, dated August1, 1871.

To all whom it may concern:

Be it known that I, HORACE SEE, of Pottsville, in the county ofSchuylkill and State of Pennsylvania have invented certain Improvementsin the Valve-Gear of Pumping-Engines, of which the following is aspecification:

My invention applies to that class of engines which employs a rod movingcoincident with the piston to operate the valve-gear; and relates:First, to the combination ofthe tappet-arms, rockshafts, and valve-rods,in such a manner that the latter make a direct connection between thevalvestems and rock-shafts. Second, to the combination of thetappet-arm, quadrant, and dash-pot arm in one piece. Third, to thecombination of the quadrant and dash-pot arm in one piece.

Fig. 1 is a front view of a vertical, single-acting, non-condensingengine, to which my invention is applied, with a portion of the plug-rodbroken away. Fig. 2 is a plan of the same. Fig. 3 is a side view lookingin the direction of theA arrow l with the dash-pots in section. Fig. 4Lis a detached side view of the valve-gear looking in the direction ofthe arrow 2. Fig. 5 is a detached sectional side view of the valvegearlooking in the direction of the arrow 1. Fig. Gis a front view of thevalve-gear applied to a vertical, single-acting, condensing-engine, withthe plug-rod removed 5 also, the bearing-caps taken ofi'. Fig. 7 is adetached sectional side View of the same, looking in the direction ofthe arrow 3.

A is the steam-cylinder resting on an d secured to the girders P and lfor connecting it with the foundation. B is the steam-chest connected toand communicating with the bottom of the cylinder A by the pipe O; also,communicating with the top through the pipe N. Steam is admitted to thechest through the nozzle j', and ex` hausted through g; C is apiston-rod extending above, through a stuffing-box, into the cylinder A,and secured to a piston which has not been shown. D is a cross-head withan extension below for operating the pump. The plug-rod E for operatingthe valves is worked from this crosshead and guided on the steam-chestB. F is a stem connected to the steam-valve, and G one connected to theexhaust. Neither of these valves is shown, as there is nothing novel intheir construction. His the steam, and I the exhausttappet, both beingsecured to the plug-rod E. F2 is the steam, and G2 the exhaustrock-shaft. F2

is the steam, and G3 the 'exhaust tappeti-arm, with a handle on one sideand at the end of each for working by hand. These are, respectively,secured to the rock-shafts F2 and G2. The arm F3has the quadrant F4incorporated with it. G4 is the exhaust-quadrant, secured to therock-shaft G2. M and M are bearings carrying the rock-shafts F2 and G2,and secured to the pipe N. F1 is a rod connecting the valve-stem F withthe rock-shaft F2. The rod G1 also connects the stem G with therock-shaftJ G2, the connection of these rods with the shafts being madeby pins placed out of center on an enlargement at one end. K is thesteam, and L the exhaust dash-pot plunger, working, respectively, in thepots K and L', which are joined together and secured to the pipe N. Theplunger K is connected to the arm F3 by the rod k, and the plunger L tothe quadrant G4 by the rod l, the pins for making the connection beingplaced out far enough to obtain the necessary leverage. The drawingrepresents the piston and plug-rods as moving up, the steam-valve beingopen and the exhaust closed. The double-beat Cornish valve, on accountof its being very nearly balanced, is generally used. The steam-valve iskept op en by the weight ofthe dash-pot plunger K. The weight of thedash-pot plunger Lis prevented from opening the exhaust-valve by thesteamquadrant F4 holding the exhaust-quadrant G4. The steam-tappet Hwill, by the plug-rod E moving up, strike the steam-tappet arm F3,turning the rock-shaft F2, whichwill closethe steam-valve through therod Fl and stem F 5 also, moving the steam-quadrant F4 clear of theexhaust-quadrant G4. The exhaust-quadrant G4, now being' free, is movedby the weight of the dash-pot plunger L, turning, at the same time, therock-shaft G2, which opens the exhaust-valve throughv the rod G1 andstem G; also, throwing up the exhaust tappet-arm G3. The exhaust-valvebeing open, the rods G and E will descend, and before the end of thestroke the tappet I will strike the arm G3, turning, at the same time,the shaft G2, which will close the valve through the rod Gl and stem G;also, move the quadrantG4 clear of the quadrant F4, and allow theplunger K to depress the arm F2, turning the rock-shaft F2 and raisingthe rod F1 with the stem F attached, opening by this operation thesteam-valve. The piston will again ascend, from which will follow thesame movements. It may be more convenient in the manufacture to make thequadrant F4 solid with the rockshaft F2 and afterward join the arm tothem; also, to make the quadrant G4 solid with the rock-shaft G2. Figs.6 and 7 show my invention applied to a condensing-en gine, where thesteam, exhaust, and equilibrium-Valves are in one chest. Q is theequilibrium valve-stem, which is attached to a Valve that allows thesteam, after the piston has completed the up-stroke, to pass around tothe top of the piston. Ql is the equilibrium Valve-rod connecting thestem Q with a projection on the tappet-arm Q3. Q2 is the equilibriumrock-shaft. QG is an arm on one end of the shaft Q2, and Vconnected YbytheYV rod rowith the equilibrium dash-pot plunger. Q5 is a handleincorporated with the arm Q'3 for working` the equilibrium-Valve byhand.Q4 is the equilibriumquadrant, which works with the exhaust quadrant andis secured to the shaft Q2. The exhaust tappet-arrn and quadrant are inone piece. No

quadrant is used on the steam-shaft F2, the opening of the steam as wellas the exhaust-valve being regulated by a cataract, which, on account ofits being well known, has not been shown. The

exhaust-valve is closed by the plug-rod near the end of its up-stroke.At the same time, the equilibrium-quadrant Q4 being freed, the weightofthe dash-pot plunger opens the equilibrium-valve. Theequilibrium-valve is closed by a tappet on the back of the plug-rodduring its down-stroke striking the arm Q3.

In the figures the steam and exhaust-valves are supposed to be open andthe equilibrium closed.

I do not claim the use of the tappet-arins, quadrants, rock-shafts, ordash-pot arms separately.

I claim as my inventionl l. The combination of the tappet-arin,rockshaftFand Valve-rod, substantially asrand for the purposehereinbefore set forth.

2. The combination of the tappet-arm, quadrant, and dash-pot arm,substantially as set forth.

3. The combination of the quadrant and dashpot arm, substantially as setforth.

HORACE SEE.

Witnesses:

F. C. CAMPBELL, N. O. DAYTON.

